AIR CONDITIONING SYSTEM, Diagnostic DTC:B1415/15

DTC Code DTC Name
B1415/15 Driver Side Duct Sensor

DESCRIPTION

The air duct sensor (for driver side) detects the register temperature and sends the appropriate signals to the air conditioning amplifier.

DTC Code Detection item Trouble Area
B1415/15

Air duct sensor circuit (for driver side)

(Open or short)

  • Air duct sensor (for driver side)

  • Harness or connector between duct sensor and air conditioning amplifier

  • Air conditioning amplifier

WIRING DIAGRAM

A000TWFE05

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (DUCT SENSOR (for Driver Side))


    1. Use the Data List to check if the duct sensor (for driver side) is functioning properly.

      Air conditioner
      Tester Display Measure Item / Range Normal Condition Diagnostic Note
      Duct Sensor (D Side)

      Duct sensor (for driver side) /

      Min.: -12.7°C (9.14°F)

      Max.: 76.55°C (169.79°F)

      		 Actual duct temperature is displayed (for driver side) -
      OK
      The display is as specified in the normal condition.

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    NG

  2. CHECK AIR CONDITIONING AMPLIFIER (TFAL - SG-2, TFAR-SG-3 VOLTAGE)

    A000ZHIE01
    *a Component with harness connected: (Air Conditioning Amplifier)
    *b for LHD:
    *c for RHD:

    1. Remove the air conditioning amplifier with its connectors still connected Click here.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      for LHD
      Tester Connection Condition Specified Condition
      L77-21 (TFAL) - L77-12 (SG-2) Power switch ON (IG) at 25°C (77°F) 1.8 to 2.2 V
      Power switch ON (IG) at 50°C (122°F) 0.8 to 1.2 V
      for RHD
      Tester Connection Condition Specified Condition
      L77-22 (TFAR) - L77-11 (SG-3) Power switch ON (IG) at 25°C (77°F) 1.8 to 2.2 V
      Power switch ON (IG) at 50°C (122°F) 0.8 to 1.2 V

      Tech Tips

      As the temperature increases, the voltage decreases.


    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    NG

  3. CHECK AIR DUCT SENSOR

    A000UUPE06

    1. Remove the air duct sensor Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 0°C (32°F) 14.5 to 19.0 kΩ
      25°C (77°F) 4.8 to 5.2 kΩ
      50°C (122°F) 1.6 to 2.0 kΩ

      Tech Tips

      As the temperature increases, the resistance decreases.


    NG

    REPLACE AIR DUCT SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR DUCT SENSOR)

    A000VZ5E03

    1. Disconnect the L14*1 or L87*2 air duct sensor connector.

    2. Disconnect the L77 air conditioning amplifier connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition
      L77-21 (TFAL) - L14-1 Always Below 1 Ω
      L77-12 (SG-2) - L14-2
      L77-21 (TFAL) - Body ground Always 10 kΩ or higher
      L77-12 (SG-2) - Body ground
      for RHD
      Tester Connection Condition Specified Condition
      L77-22 (TFAR) - L87-1 Always Below 1 Ω
      L77-11 (SG-3) - L87-2
      L77-22 (TFAR) - Body ground Always 10 kΩ or higher
      L77-11 (SG-3) - Body ground

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR